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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '767b4b0eac3d25a21cb794bfb79fa8904e2b4465d319e7e00bc8c76f1258e52a' 
  AND token = 'C1M8T7yRlI+Qfkzhvq9yuHtCKGt7c9F7ys9C2PknBng=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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