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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6fa9c3d56201004be819ddecebd0b5232fe976d9c4f7229289fa76ef92e5b32c' 
  AND token = '4v/f4JEfI0ZO5vdUh17Qvx4ZLWm8FDCxgb9+e1crrvU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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