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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c9ac3d8505725181954ec40233783e4be578067d3edb8a7eca589ebdfdac1ae' 
  AND token = 'g20tp3raQVx91HfhksdVZW9Uk8jMLtkjgI8IobIa1SQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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