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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9cc40c9c8869712a20deaa7befd8273cd9a7b31d9ea4f85cb06366de3158162' 
  AND token = '8L8qo/2YE03sWavTJzNzO9ZzxXHY37IEhrmdMjJ2Hdk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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