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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf4c061e480fbdba6dd78aa70b6a94dc9c5bd807d9dc2d55641f7420a86a8aa7' 
  AND token = '/7xfde0kdB3cZ03ptMdNdOto9Z86ciXTYgTzZQsoIEY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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