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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83f2464b3fe56b6c882e58d09c6f77c07f7f558d0a7cdb1d91e95b7d4f7f1d9d' 
  AND token = '0GZwGzI32e4ScvTJEP7514fKXux1RiFaeBk7ac3YYgc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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