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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36ccaf9a5e18a0f1a736333139c6c1314053c2de48a400dd8ab03325bf9274d6' 
  AND token = '4mxdE44TJAY0L2k0opxr99zFlExVBd1AP5Ih/o8y0vA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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