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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '055ec7c897815afad26a158bc4f1c0e17cfb7d27acda11759f056b801c1e20db' 
  AND token = 'hnl+ww4zjtEEDp2olHMRwootdGgKmsxG4yo2Vds8EGE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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