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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7059e3d686ff05de28c1728e428aaaab66220ebd06854a4f374c8faf02a3f1c5' 
  AND token = 'eBte4kd5HvZ4p280q84DLEVqkW5qKrDl1XEyJRu/ZPM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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