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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d444fd3f513869a6b126c698e7ee421e340df6ca35da147a6f313ec4eb1ad5e' 
  AND token = 'F274wiPvx77xS80Yyc5uQd0/9FmwIb/wESQ1+dDsUVs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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