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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '471ae856cdb08e844f8ea56b0242fa4f6ed3de96000e3b2999214c1250e8cbef' 
  AND token = 'KB/4Ub7n+xA1zk9etYKCUoDrD1W6bN8szrcPLDTaviY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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