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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ba2cd40ea96ba84c5d0850857e9771b0742001eddc19ce787aa2a5f0f191261' 
  AND token = 'pAADKqimX82/c1onMrpVv5YuoqhJeGVnjjzA2MXOwvA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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