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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88cf2cfbbfc41db6a5d6b81dd0af5606f554e02f0ae95933a2c3ba619f6689e9' 
  AND token = '8XxQXtj7nXMV/FPH3WmhmdHMeWp0T7tOxxIsVhMxbek=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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