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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad1289e9fade0d4e8c56f9c848333eb7a25b866b6b11fb9c77094e054423fb1d' 
  AND token = 'VIjlyAm9yX5Xo16jDJkHTdleFYxm88YWYyzXE0kY0iw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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