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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ee1e4efeb45432627ab5f4b5396457623b9065debb05fb84832a36fb1ba443b' 
  AND token = 'lucFK52Sxo61INIuwrJ3AIZBOGnbYer4DkT/vbsbtTg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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