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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb34ee327bd9a4d06251375d346a0afe97f5937fb6fb99a797d6a876b853b233' 
  AND token = '2E+1FcemW29uYjsc+HYrGvqgWF3fO+X+qjqdUqIfWi0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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