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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '472f95f6f6bb4dcf310ec29d242092abc490fe50d9e0767c724add6869d82969' 
  AND token = 'yoYBPRtFg+i85LCSXY+hsS6O3CC6HnSbmP92KwSr/VU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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