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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ce037c52295fb848653c3a47ea48f1500333f3ef1d8accf91aa47db8aeadc52' 
  AND token = 'LmZq5Vwkstg4SbN/QF5IecLMoZFA5LGKDNucj6jppWw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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