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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0f6a92e52131f7a2dc8ea1b7d9a6daccd19b068712bc0585e4e40f0d9fac7bd' 
  AND token = 'AqGPA5BxEcIznE/dj9uf5Q3gG/y8POiz0hqnJ3QEVd4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}