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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aec499b488cffdb8acf368e03ba70b8f63c4bc8e44896bc4092ea0c80a3c665c' 
  AND token = '/x1x+Y05khiNoElIdfKtvWEVU4li3VLqumyw3eEoQOA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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