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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5f1930901c79ea681bc655b43501e56c0055590fa62ed2fece842c4ef3ae717' 
  AND token = 'ni9oBZ2x6ICD9qUtvwxI631Xljv2nIBnPfEFM3Ufmg0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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