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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96a2fb9ec125d396c11496c661bca11ec079e1674c3545edec99085cc179eb45' 
  AND token = '1GJX/bl6D/gutnxF+Bzbv4PT9rgh4Z4s5Pl61wGW+lE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00067

JSON explain

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