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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb12a59cec395a58655316e1a9b92290955e86a7908587c677aec589beb2cb3a' 
  AND token = 'elDZU/mIb9sQ0OmrYpcmwOin+WH77F84ZOJ1SJpAPWM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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