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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b0bd88c67adf0b6d919204ac6115b3294f6c750cdc5872b416d555de4a2ee16' 
  AND token = 'dBmnpPs7ipd7mP7H794FwaOsgE07WJMxeRTTdmAohs8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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