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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff05257bb77f7a6aefe4e6e8320a91124b9428125280faa619912d6ae77e6b5a' 
  AND token = 'qbV9e/pwhGhI0q2uO1l5MXmCkuFmA/xQprCM40WaOXc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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