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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd23f2dc531eafb1cb0fd29d9733638eb903a23dcc5cc5ac41637acfef36d1040' 
  AND token = 'zPzHg6vfL0gyItgjlSXu0Es8iIrf2ljd5aM2lE7u0IQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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