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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07117706e2181dc6b11077708edbf9367fc83f960ff0b3c24357adef3c4fbda7' 
  AND token = 'RrN7URg8zFnjsyEIhUWB87Lmy2vGygOBDkbiiFr7yC0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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