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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3eb19aaff3bff86c992b095bdc7d26e4d175036c82ee3cdcf1d7569bd4c7ba56' 
  AND token = 'tN08tIRdlcBXggWqdBHRuFloVIV3y5/ki9OmwspfJYk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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