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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7d7fc3dfd3b1305ab32f01ec156440b3620330e313673ddec6606aa9ccf1912' 
  AND token = 'yqPplR3fqnY8qsd/V8oASYd5n/PJm2YdVaqpqyas7SE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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