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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e02b736a7be75f8104fc77478a55f2d7c1fb28052d2acc0ac25ef29805f6957' 
  AND token = '2ZiV0GmRyGe/Ju8yb6Ukf0lbn33pLqn3+677OMQ49Yg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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