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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6879ead679cda9db961df1d0305f453e840b73a218ef09fbc9deb46a5795a52' 
  AND token = '11Z0w7pQOPeVE1lkdeFxeyhYO273ZkWEro5c7m8i6KA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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