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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be59e2a435ba564db329dfd473bdd4c5794852cac342f7f486e990a6ad6ff3f7' 
  AND token = 'pHW5VX46meDfv7Uf4cxga9J7nGGbhNaoeIuQrRGpuiw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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