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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '661b43c59c1d2f9d1ec1b03953405cf4725cd59bb75e7568ae03b75a52b9d16f' 
  AND token = 'qOP14zJRro3fRyvVaW24yAiQJ5oO7i3xKp186QS/39c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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