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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ddad055a4ebbbcd1bd2a74330a763d24081ce4c0f91053b52023fcdab2dde77' 
  AND token = 'uCdgwLqiWcmJHyICPVHnw+S291SB507HG3vzQXN5nSc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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