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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '117ce99327632af7e6778f1f2b009214fe4a851020c3ae1116c4ae08f391a9f8' 
  AND token = '6HifH19L8RG+UIf39puUjv823dZnFTvr5k7uph5vSkM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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