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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '16aa9359f8886a780c6e9e4cca7fe9d839cb915e5b90e9a9035cef8d20fdfdea' 
  AND token = 'RTfH9LKu3kQ6Q2C37UKBCoqEM7QliZDmUgxzg1W9I+8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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