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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2967580dc58af94bf7b00a2dc47b62fba45f952d43669511543cb9ce6cf7e68' 
  AND token = '0HsmvCtgd5Wstpwk3wxhfacW6PxClwODYGs0Ckmxr1I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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