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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7dfaa09dbc7178ecb5a7e20d42b9ef8db7937781d5c68cc43ac3611b77a587b8' 
  AND token = 'wT7dUKzZdKL8tGDruaISyX+C2NgblMdDTpmM4jFjUw4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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