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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1cd644f9e56f81f42c88486a1ebdc519362d863838f07857482e8522054d839' 
  AND token = 'rJ7kGfjrwf51GXIFSDXicvzUaf27og1D4Pjs/MAqZfw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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