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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8f8b37d9030161671883130e2931b725267de5794ad76ea645124f8fb61d686' 
  AND token = 'SHY9EBem5lmQ3RQ34yuTY0dfGJ/8f+QBocZmWGGwrY8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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