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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '439a7304cf691ecc6b170afa43b1125a0da248eb510c5a04cf66fe4c0e04ee75' 
  AND token = 'TP9Jcv/DRSWEqlTxFgRZ8olLgblYBDLivXyDerlfAnc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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