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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '530209d0c9ee75c9c84e4f4f5bb83602b84e04d670ce1a5327351fa0c2593be1' 
  AND token = 'CppRm1MOIkY18ZVGSbJ9UptfNOsmQsAhtKQGmn2/IjA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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