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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04b5507c3d00ebba33c15d3ed38dbffcf33c573e0505e4a46fc76186ee6bcc40' 
  AND token = 'OWHM+i+VuvzSMciRbvn+DT5v6I4J5OrLtrf5uyvnTVk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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