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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6799559f1cb6678a24c0af319310ce8583812a91aa6b971188cc2c16e68daf79' 
  AND token = 'HLoyj0cEdwtmspew+17J1zWALpxTfJRsdsB1R/g33Jo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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