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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b1c1970b9bdcc52dd969cf37dec1a24eea1bb5fc2ea54e6d8f6fd84d963c8f5' 
  AND token = '2F7vuIx7kC2lc2aWRzmoaGNYdk+VLbl5wVLzYYOPWKQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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