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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e97c368a9bd0e5dd147a9377abe498c96fed8d132ed104ff332f49ba722e01a' 
  AND token = 'JI/WP/5bkhGHk8tzUlXU01AFoGWll3peKFsMPGFKR3A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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