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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b976664c06913f3cd71a791cf900c97f4cf6a742f8ade3ae0296023f95e03c7' 
  AND token = '5xraQ8plR5SbafpDO4eSdfsEi9GsIwm+PtJLiTsj7Y8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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