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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ddbb93915f5e065a5c255afa293b0abf12867359522ab7f0207527cf99572f42' 
  AND token = 'ts/VcZ7671iv/2vW9UN+1hLGerkPqMK1LMHOSdSO8wA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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