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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d27a337284a430d113af154b8730e18efd45686c1ad0b442f37f87d09444bd3' 
  AND token = 'dfvqpdF37vvmzAcJ3EhCktpbCuHGJc7gYrAX8r6ucf8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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