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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbc40be52cb99233d3b013f08f7b9fe06ec1592d313baf15def06fe9938fea61' 
  AND token = 'y2J1t3GmjB9j6cUQgytGEcJrq6Vu6+rO2Cmox/4Dxl8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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