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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e23bfa3476cac42f8ac7a97fa19f5d7ec1fb705f74dcce1294b027ed3d2bc1f' 
  AND token = 'jxgUVfXB1Aa1xFbZ87GyX0oc/ILAQr++hTLOTLNmNQw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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