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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90536b488b104198c106216c56f35bc9b490aac85762d4ae4d5b274b49bd45c3' 
  AND token = 'E2I0ht0EvVOBN9g6MHdO/1GzjHnL/cIx/6WfHSQlUAA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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