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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39cae266dba58d182a2b0995835dbd42baf6fcac2d57ecfb986c02d4f747e810' 
  AND token = '5d8YL83gwbDIesLgtfu4+DUvamQ75KDZAgYwnY8Z/vU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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