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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ecda5dd723cc4da94c6626345f926bd6342dc0f024dc2f409f7b92ad6d386d0' 
  AND token = 'WJ/4nHsljEs/lRX7A6dhFLm9TKawE6uGzqVHXqvrPrw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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