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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bac5439b44ff6e976c8e6ebc2dbb0e213bd1c31bba07eee795bebfeeb3a3fbbf' 
  AND token = 'mbPvdyH8+wmfGHsXy5ZfGz8mSKM0T66qd13olHYt+RI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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