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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cddece5160b77fe4efe17a4c62a42d1c3839f27ceddfd0f8b963b04e5686d70a' 
  AND token = '2iO36s3YrdkCjpK56ZBflzqqX3Q4uY12l5tBPRqeP5k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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