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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1792b7140e0309dc5ef8bae42f19834a9a73248aefa0652efb2f2562a62bbc7c' 
  AND token = '3XTQGeIKzqs++Rou+uT2Fsm0hiTi7RFZ27DZye63hCA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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