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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8924ff2f24fc4459da9b194d4e9efa81736c93817a4d31c0efd3503698a76f85' 
  AND token = '5qh1Zd2TSKu7d4JMIHyuH+t3gd3PHRwVKhbhq3JyFJU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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