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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0922091d23df0f5016e2058775517d5d90b979df55351fc13f0534b181daee8' 
  AND token = 'TfZWVByW/kJQIPn/9LzP8yOLLEu1cxnnyhQomSfJiUo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

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