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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9dc8959c90efaab1367c095cfd673067e05abf445dd462c89fbdf6f10367f743' 
  AND token = 't9WVAKdZMKkaGO+JVA3m+Q7IhbeLWeDdPcjaOac/8Os=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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