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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9445b7ed4c0429ae1527b4a7a199159a97eecf908638c9909340cac0b1ce5e7' 
  AND token = 'H8wDFFb4n/06Hba03dwfw6vR3ImUtbsAPNz1w5nCm/g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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