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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6df786a955b70a06900f4aa59f97b5b12d5b3fea806d5ca5c822a7ed28b68473' 
  AND token = '7aHlJ69s0wi3eVO7rU+PeoHEcMiIEmVmNwm5VYen1qM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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