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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '850d2596918e61a0c73a338effd5a4e79768579bbf95972e0158903c18dc0e13' 
  AND token = '+oKZ8JXmd3hp4cAqpsnyZb7co02jcEu1aNxc9LqUt8A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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