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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d993ffdf2ea596325f309a73e2efdc30d81e8574b47ba0743251bc87bfbf414' 
  AND token = 'rzFQxpihM7u2/jFCrN/UYgorIwxOnS0OwbM/8BkiZ1U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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